What the result of the study showed was that listeners who doodled recall more informations,a finding that researchers believe is due to doodling preventing people from daydreaming.

이 문장에서 마지막부분에 dooding 다음에 어떻게 또 preventing이라는게 나오는지 문법적인 설명이 필요합니다. 답변부탁드릴께요!!